01 -
Preheat the oven to 375°F (190°C).
02 -
Melt 2 tablespoons butter in a skillet over medium heat. Add minced onion and garlic. Cook slowly until onions caramelize to a dark brown, about 15 minutes.
03 -
In a saucepan over medium-high heat, combine cream, tomato sauce, remaining butter, salt, cayenne pepper, and garam masala. Bring to a simmer.
04 -
Reduce heat to medium-low, cover, and simmer for 30 minutes, stirring occasionally. Stir in the caramelized onions.
05 -
Toss chicken with vegetable oil until coated. Season with tandoori masala and spread out on a baking sheet.
06 -
Bake chicken in the preheated oven until no longer pink in the center, about 12 minutes.
07 -
Add cooked chicken to the sauce and simmer for 5 minutes before serving.